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ID = 60555
United States of America (USA)
Brand: Moorhead Laboratories (Pacific); San Francisco
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to R_Moorhead_H
Similar Tubes
Other shape (e.g. bulb type):
  R_Moorhead ; VT32_Moorhead
Predecessor Tubes R_Moorhead  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Military and/or Government
Filament Vf 4 Volts / If 0.7 Ampere / Direct / Battery =

A life of 800 hours was expected when filament was operated at 4 volts. During WWI Moorhead supplied European based vacuum triodes, marked as R type, to the British Army. British also designated these tubes as VT32.

The R_Moorhead_H was a general purpose vacuum triode with spherical bulb, horizontal electrodes and a visible R marking, similar to other British R types. This can be considered a transition from the early vertical electrode R_Moorhead to the later VT32_Moorhead, characterized by a quasi-cylindrical envelope.
The base of this tube was made by the Shaw Insulator Company, who were associated with Moorhead Laboratories.

Dimensions (WHD)
incl. pins / tip
54 x 109 x 28 mm / 2.13 x 4.29 x 1.10 inch
Weight 41 g / 1.45 oz
Information source -- Collector info (Sammler)   
Saga of the Vacuum Tube, Tyne   Page 170

b4_base_pins~~20.png R_Moorhead_H: Fin Stewart
Fin Stewart

Just Qvigstad

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